C1254

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1254: Pressure Sensor or Switch

DESCRIPTION

The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.









INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform calibration Programming and Relearning.

PROCEDURE

1. READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Depress the brake pedal more than 40 times.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(g) Check the accumulator output value.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly
A -- Continue to next step.

2. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Depress the brake pedal more than 40 times.

(d) Turn the engine switch on (IG).

(e) Wait until the pump motor stops.

(f) Wait for 15 minutes.

(g) Depress the brake pedal and release it.

(h) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting